package com.naihe.anderson.sms.widgets;

import android.app.Dialog;  
import android.content.Context;  
import android.graphics.Canvas;  
import android.graphics.Color;  
import android.graphics.LinearGradient;  
import android.graphics.Paint;  
import android.graphics.RectF;  
import android.graphics.Shader;  
import android.graphics.SweepGradient;  
import android.os.Bundle;  
import android.util.Log;  
import android.view.MotionEvent;  
import android.view.View;  
import android.view.WindowManager;  

/**
 * 颜色选择器
 * @author Anderson
 *
 */
public class ColorPickerDialog extends Dialog {  
    private final boolean debug = true;  
    private final String TAG = "ColorPicker";  
      
    Context context;  
    private String title;//标题  
    private int mInitialColor;//初始颜色  
    private OnColorChangedListener mListener;  
  
    /** 
     * 初始颜色黑色 
     * @param context 
     * @param title 对话框标题 
     * @param listener 回调 
     */  
    public ColorPickerDialog(Context context, String title,   
            OnColorChangedListener listener) {  
        this(context, Color.BLACK, title, listener);  
    }  
      
    /** 
     *  
     * @param context 
     * @param initialColor 初始颜色 
     * @param title 标题 
     * @param listener 回调 
     */  
    public ColorPickerDialog(Context context, int initialColor,   
            String title, OnColorChangedListener listener) {  
        super(context);  
        this.context = context;  
        mListener = listener;  
        mInitialColor = initialColor;  
        this.title = title;  
    }  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        WindowManager manager = getWindow().getWindowManager();  
        int height = (int) (manager.getDefaultDisplay().getHeight() * 0.5f);  
        int width = (int) (manager.getDefaultDisplay().getWidth() * 0.7f);  
        ColorPickerView myView = new ColorPickerView(context, height, width);  
        setContentView(myView);  
        setTitle(title);  
    }  
      
    private class ColorPickerView extends View {  
        private Paint mPaint;//渐变色环画笔  
        private Paint mCenterPaint;//中间圆画笔  
        private Paint mLinePaint;//分隔线画笔  
        private Paint mRectPaint;//渐变方块画笔  
          
        private Shader rectShader;//渐变方块渐变图像  
        private float rectLeft;//渐变方块左x坐标  
        private float rectTop;//渐变方块右x坐标  
        private float rectRight;//渐变方块上y坐标  
        private float rectBottom;//渐变方块下y坐标  
          
        private final int[] mCircleColors;//渐变色环颜色  
        private final int[] mRectColors;//渐变方块颜色  
          
        private int mHeight;//View高  
        private int mWidth;//View宽  
        private float r;//色环半径(paint中部)  
        private float centerRadius;//中心圆半径  
          
        private boolean downInCircle = true;//按在渐变环上  
        private boolean downInRect;//按在渐变方块上  
        private boolean highlightCenter;//高亮  
        private boolean highlightCenterLittle;//微亮  
          
        public ColorPickerView(Context context, int height, int width) {  
            super(context);  
            this.mHeight = height - 36;  
            this.mWidth = width;  
            setMinimumHeight(height - 36);  
            setMinimumWidth(width);  
              
            //渐变色环参数  
            mCircleColors = new int[] {0xFFFF0000, 0xFFFF00FF, 0xFF0000FF,   
                    0xFF00FFFF, 0xFF00FF00,0xFFFFFF00, 0xFFFF0000};  
            Shader s = new SweepGradient(0, 0, mCircleColors, null);  
            mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);  
            mPaint.setShader(s);  
            mPaint.setStyle(Paint.Style.STROKE);  
            mPaint.setStrokeWidth(50);  
            r = width / 2 * 0.7f - mPaint.getStrokeWidth() * 0.5f;  
              
            //中心圆参数  
            mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);  
            mCenterPaint.setColor(mInitialColor);  
            mCenterPaint.setStrokeWidth(5);  
            centerRadius = (r - mPaint.getStrokeWidth() / 2 ) * 0.7f;  
              
            //边框参数  
            mLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);  
            mLinePaint.setColor(Color.parseColor("#72A1D1"));  
            mLinePaint.setStrokeWidth(4);  
              
            //黑白渐变参数  
            mRectColors = new int[]{0xFF000000, mCenterPaint.getColor(), 0xFFFFFFFF};  
            mRectPaint = new Paint(Paint.ANTI_ALIAS_FLAG);  
            mRectPaint.setStrokeWidth(5);  
            rectLeft = -r - mPaint.getStrokeWidth() * 0.5f;  
            rectTop = r + mPaint.getStrokeWidth() * 0.5f +   
                    mLinePaint.getStrokeMiter() * 0.5f + 15;  
            rectRight = r + mPaint.getStrokeWidth() * 0.5f;  
            rectBottom = rectTop + 50;  
        }  
  
        @Override  
        protected void onDraw(Canvas canvas) {  
            //移动中心  
            canvas.translate(mWidth / 2, mHeight / 2 - 50);  
            //画中心圆  
            canvas.drawCircle(0, 0, centerRadius,  mCenterPaint);  
            //是否显示中心圆外的小圆环  
            if (highlightCenter || highlightCenterLittle) {  
                int c = mCenterPaint.getColor();  
                mCenterPaint.setStyle(Paint.Style.STROKE);  
                if(highlightCenter) {  
                    mCenterPaint.setAlpha(0xFF);  
                }else if(highlightCenterLittle) {  
                    mCenterPaint.setAlpha(0x90);  
                }  
                canvas.drawCircle(0, 0,   
                        centerRadius + mCenterPaint.getStrokeWidth(),  mCenterPaint);  
                  
                mCenterPaint.setStyle(Paint.Style.FILL);  
                mCenterPaint.setColor(c);  
            }  
            //画色环  
            canvas.drawOval(new RectF(-r, -r, r, r), mPaint);  
            //画黑白渐变块  
            if(downInCircle) {  
                mRectColors[1] = mCenterPaint.getColor();  
            }  
            rectShader = new LinearGradient(rectLeft, 0, rectRight, 0, mRectColors, null, Shader.TileMode.MIRROR);  
            mRectPaint.setShader(rectShader);  
            canvas.drawRect(rectLeft, rectTop, rectRight, rectBottom, mRectPaint);  
            float offset = mLinePaint.getStrokeWidth() / 2;  
            canvas.drawLine(rectLeft - offset, rectTop - offset * 2,   
                    rectLeft - offset, rectBottom + offset * 2, mLinePaint);//左  
            canvas.drawLine(rectLeft - offset * 2, rectTop - offset,   
                    rectRight + offset * 2, rectTop - offset, mLinePaint);//上  
            canvas.drawLine(rectRight + offset, rectTop - offset * 2,   
                    rectRight + offset, rectBottom + offset * 2, mLinePaint);//右  
            canvas.drawLine(rectLeft - offset * 2, rectBottom + offset,   
                    rectRight + offset * 2, rectBottom + offset, mLinePaint);//下  
            super.onDraw(canvas);  
        }  
          
        @Override  
        public boolean onTouchEvent(MotionEvent event) {  
            float x = event.getX() - mWidth / 2;  
            float y = event.getY() - mHeight / 2 + 50;  
            boolean inCircle = inColorCircle(x, y,   
                    r + mPaint.getStrokeWidth() / 2, r - mPaint.getStrokeWidth() / 2);  
            boolean inCenter = inCenter(x, y, centerRadius);  
            boolean inRect = inRect(x, y);  
              
            switch (event.getAction()) {  
                case MotionEvent.ACTION_DOWN:  
                    downInCircle = inCircle;  
                    downInRect = inRect;  
                    highlightCenter = inCenter;  
                case MotionEvent.ACTION_MOVE:  
                    if(downInCircle && inCircle) {//down按在渐变色环内, 且move也在渐变色环内  
                        float angle = (float) Math.atan2(y, x);  
                        float unit = (float) (angle / (2 * Math.PI));  
                        if (unit < 0) {  
                            unit += 1;  
                        }  
                        mCenterPaint.setColor(interpCircleColor(mCircleColors, unit));  
                        if(debug) Log.v(TAG, "色环内, 坐标: " + x + "," + y);  
                    }else if(downInRect && inRect) {//down在渐变方块内, 且move也在渐变方块内  
                        mCenterPaint.setColor(interpRectColor(mRectColors, x));  
                    }  
                    if(debug) Log.v(TAG, "[MOVE] 高亮: " + highlightCenter + "微亮: " + highlightCenterLittle + " 中心: " + inCenter);  
                    if((highlightCenter && inCenter) || (highlightCenterLittle && inCenter)) {//点击中心圆, 当前移动在中心圆  
                        highlightCenter = true;  
                        highlightCenterLittle = false;  
                    } else if(highlightCenter || highlightCenterLittle) {//点击在中心圆, 当前移出中心圆  
                        highlightCenter = false;  
                        highlightCenterLittle = true;  
                    } else {  
                        highlightCenter = false;  
                        highlightCenterLittle = false;  
                    }  
                    invalidate();  
                    break;  
                case MotionEvent.ACTION_UP:  
                    if(highlightCenter && inCenter) {//点击在中心圆, 且当前启动在中心圆  
                        if(mListener != null) {  
                            mListener.colorChanged(mCenterPaint.getColor());  
                            ColorPickerDialog.this.dismiss();  
                        }  
                    }  
                    if(downInCircle) {  
                        downInCircle = false;  
                    }  
                    if(downInRect) {  
                        downInRect = false;  
                    }  
                    if(highlightCenter) {  
                        highlightCenter = false;  
                    }  
                    if(highlightCenterLittle) {  
                        highlightCenterLittle = false;  
                    }  
                    invalidate();  
                    break;  
            }  
            return true;  
        }  
  
        @Override  
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  
            super.onMeasure(mWidth, mHeight);  
        }  
  
        /** 
         * 坐标是否在色环上 
         * @param x 坐标 
         * @param y 坐标 
         * @param outRadius 色环外半径 
         * @param inRadius 色环内半径 
         * @return 
         */  
        private boolean inColorCircle(float x, float y, float outRadius, float inRadius) {  
            double outCircle = Math.PI * outRadius * outRadius;  
            double inCircle = Math.PI * inRadius * inRadius;  
            double fingerCircle = Math.PI * (x * x + y * y);  
            if(fingerCircle < outCircle && fingerCircle > inCircle) {  
                return true;  
            }else {  
                return false;  
            }  
        }  
          
        /** 
         * 坐标是否在中心圆上 
         * @param x 坐标 
         * @param y 坐标 
         * @param centerRadius 圆半径 
         * @return 
         */  
        private boolean inCenter(float x, float y, float centerRadius) {  
            double centerCircle = Math.PI * centerRadius * centerRadius;  
            double fingerCircle = Math.PI * (x * x + y * y);  
            if(fingerCircle < centerCircle) {  
                return true;  
            }else {  
                return false;  
            }  
        }  
          
        /** 
         * 坐标是否在渐变色中 
         * @param x 
         * @param y 
         * @return 
         */  
        private boolean inRect(float x, float y) {  
            if( x <= rectRight && x >=rectLeft && y <= rectBottom && y >=rectTop) {  
                return true;  
            } else {  
                return false;  
            }  
        }  
          
        /** 
         * 获取圆环上颜色 
         * @param colors 
         * @param unit 
         * @return 
         */  
        private int interpCircleColor(int colors[], float unit) {  
            if (unit <= 0) {  
                return colors[0];  
            }  
            if (unit >= 1) {  
                return colors[colors.length - 1];  
            }  
              
            float p = unit * (colors.length - 1);  
            int i = (int)p;  
            p -= i;  
  
            // now p is just the fractional part [0...1) and i is the index  
            int c0 = colors[i];  
            int c1 = colors[i+1];  
            int a = ave(Color.alpha(c0), Color.alpha(c1), p);  
            int r = ave(Color.red(c0), Color.red(c1), p);  
            int g = ave(Color.green(c0), Color.green(c1), p);  
            int b = ave(Color.blue(c0), Color.blue(c1), p);  
              
            return Color.argb(a, r, g, b);  
        }  
          
        /** 
         * 获取渐变块上颜色 
         * @param colors 
         * @param x 
         * @return 
         */  
        private int interpRectColor(int colors[], float x) {  
            int a, r, g, b, c0, c1;  
            float p;  
            if (x < 0) {  
                c0 = colors[0];   
                c1 = colors[1];  
                p = (x + rectRight) / rectRight;  
            } else {  
                c0 = colors[1];  
                c1 = colors[2];  
                p = x / rectRight;  
            }  
            a = ave(Color.alpha(c0), Color.alpha(c1), p);  
            r = ave(Color.red(c0), Color.red(c1), p);  
            g = ave(Color.green(c0), Color.green(c1), p);  
            b = ave(Color.blue(c0), Color.blue(c1), p);  
            return Color.argb(a, r, g, b);  
        }  
          
        private int ave(int s, int d, float p) {  
            return s + Math.round(p * (d - s));  
        }  
    }  
      
    /** 
     * 回调接口 
     * @author <a href="clarkamx@gmail.com">LynK</a> 
     *  
     * Create on 2012-1-6 上午8:21:05 
     * 
     */  
    public interface OnColorChangedListener {  
        /** 
         * 回调函数 
         * @param color 选中的颜色 
         */  
        void colorChanged(int color);  
    }  
      
    public String getTitle() {  
        return title;  
    }  
  
    public void setTitle(String title) {  
        this.title = title;  
    }  
  
    public int getmInitialColor() {  
        return mInitialColor;  
    }  
  
    public void setmInitialColor(int mInitialColor) {  
        this.mInitialColor = mInitialColor;  
    }  
  
    public OnColorChangedListener getmListener() {  
        return mListener;  
    }  
  
    public void setmListener(OnColorChangedListener mListener) {  
        this.mListener = mListener;  
    }  
}  